试验结果表明，烟气在大空间内的温度并不高，但烟气层下降速度很快。
The results showed that the temperature rise of smoke layer was very low, but the descending of smoke layer was quick.
这就要求在规定的逃生时间内，保证烟气层存在于规定的逃生安全高度以上。
This involves keeping the height of the smoke layer above the highest level of occupancy for a defined period of time, longer than the expected time to evacuate the building.
当中庭排烟速率大于或等于产烟速率时，烟气层就能够保持在一定高度上不降下来。
The smoke layer can been in definite height and not descend when the smoke exhaust rate is larger than that of generating smoke.
通过对实验结果的分析，我们建立了火灾中庭内烟气层填充高度随时间变化的回归方程。
Through the analysis on the experimental results, the regress equations about smoke layer's height change with time were estimated.
文章建议根据火源释热率、火灾发生后的逃生时间、烟气层的控制高度合理确定大空间的机械排烟速率。
Therefore the article recommends that according to fire heat release rate, escape time and control height of smoke layer, the rate of mechanical smoke extraction should be reasonably decided.
基于能量平衡方程建立了热烟气层轰燃模型，经量纲归一化和微分同胚变换，得到属于燕尾突变的势函数。
A catastrophe potential function, which has the same form of swallowtail catastrophe, was obtained by dimensional normalization and diffeomorphism.
对“死区”和烟气区内流动和分层现象的研究表明，利用示踪棒测量火灾烟气层高度并定性的揭示流动性状是可行的。
The phenomenon of dividing areas has been analyzed in this paper . It is shown by the research of smoke flow and layering in smoke flow…
结合不同的烟气羽流模型与门口溢流模型，对室内火灾过程进行建模，利用区域模拟方法计算室内热烟气层厚度及温度随时间的变化情况。
The applicability of the different plume models was analyzed on the basis of the comparison between the calculated results and the experimental data.
结合不同的烟气羽流模型与门口溢流模型，对室内火灾过程进行建模，利用区域模拟方法计算室内热烟气层厚度及温度随时间的变化情况。
The applicability of the different plume models was analyzed on the basis of the comparison between the calculated results and the experimental data.
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